The phrase comes from everyday Brazilian Portuguese, with bosta used as a vulgar word for poop and also for something worthless or badly made. Short audios built around a single rude line like this circulate widely in Brazil through WhatsApp forwards, meme pages and soundboards, where they are saved and reused out of context. Its popularity comes from that reuse, as the line can answer photos, videos or messages without any setup, and the deadpan tone keeps it recognizable even among similar gross-out clips shared online.